Abstract

The anions [Tc(NS)X 4] − (XCl, Br or NCS) can be prepared from the reaction of TcCl 6 2− and TcBr 6 2−, respectively, with trithiazyl chloride, (NSCI) 3. The equatorial ligands are kinetically labile and the complexes undergo ligand exchange reactions to form [Tc(NS)Cl n Br 4− n ] − mixed-ligand complexes ( n=1−3) or the isothiocyanate analogue [Tc(NS)(NCS) 4] −. The new compounds have been studied by EPR and the obtained parameters have been used to describe bonding properties. [Tc(NS)Cl 4] − and [Tc(NS)Br 4] − are instable in solution. Spontaneous decomposition results in nitridotechnetium(VI) complexes. The products have been characterized by EPR and X-ray diffraction.

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